What is the difference between a 318 oil pan and any other small block Mopar. I ordered a 318 pan and its different from the one I took off. One of the end rubber gaskets don't fit because the mating surface is smaller on one end than the other and the two small holes where the gasket pops through are missing. What pan did I get.

The SB Mopars changed their design slightly in the late 70s-early 80s....not quite sure of the year. I know that the front cover changed, so it may take a slighly different pan.

Was that the poly block change? Because I think after the poly the regular 318 was same as magnum blocks.
I thought about putting that in my above post but decided not as I don't know exactly what I'm talking about.

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